Plug gauge



June 8 1926. 1,588,362

B. M. w. HANSON V PLUG GAUGE Filed Oct. 22. 1924 Patented June 8, 1926.

UNITED STATES PATENT or -rice.

BENGT New. i'rANsoN, or HARTFORD, CONNECTICUT; EINARA. HANSON AND CLAR- ENCE n. WHITNEY nxnou'rons or sAID BENGT M. w. HANSON, DECEASED.

Y PLUG- GAUGE.

Application filed October 22, 1924. Serial No. 745,130. r

Thisinventionrelates to screw testing devices and, more particularly, to thread gauges of the type commonly called plug gauges.

An aim of the invention isto provide a gauge of this sort having various features of novelty and advantage, and which is particularly characterized by the simple and effective manner in which the gauging memher which referablv is double ended is 7 7 .1 7 7 secured to the handle.

Other objects will be in part obvious and in part pointed out more in detail hereinafter.

The invention accordingly consists in the features of construction, combination of elements and arrangement of parts which will be exemplified in the constructionlhereinafter set forth, and the scope of the application of whichwill be indicated in the appended claims.

In the accompanying drawings, wherein I have shown, for illustrative purposes, two embodiments which the present invention may take; V

Figure 1 is a side elevational view of the gauge with the handle. in longitudinal section;

Fig. 2 is a side View of the handle; Fig. 3 is an end view of the gauge looking a't'the left hand end of Fig. 1; and I Fig. 4 is a view similar to Fig. 1, but.

showing another embodiment of the invention.

Referring to the drawings in detail, and particularly to the embodiment of Figs. 1 to 3, inclusive, (1 denotes a handle; I), a gauging member, and 0, a tapered sleeve or bushing for binding the parts together. In this embodiment, the handle is'generally of tubular form and, preferably, its external periphery is polygonal, for example hexagonal, so that the device, when laid on a.

The gauging member 6, in the present instance, comprises a generally cylindrical part having, at its respective ends, threads 14 and 15 which are similar. By way of illustration, these threads are shown as being identical in construction, that is, of the same pitch, diameter, size and shape. If desired, the gauging member, intermediate its ends, may have an unthreaded portion 16. The gauging member may be considered as having a single thread extending substantially throughout its length, the thread being interrupted to form the portion 16. In the present instance,the gauging member is shown as having its extreme ends terminating in conical portions 17, the purpose of which is to permit the gauging member to be supported in the workholder of a grinding machine or the like with the ends 17 positioned in recesses in the opposed centers of the work holder. This arrangement is particularly adapted for use where the gauging member is of rather. small diameter.

From the foregoing description, it will be seen that, to finish the gauging member I), the same may be rotatably mounted with its ends 17 positioned in recesses in the centers of a work holder, and a grinding wheel may be moved longitudinally of the gauging member from one end to the other thereof so as to accurately grind both of the threads 14 and'15 in a single grinding operation. To secure the gauging member to the handle, one end of the former is screwed into the threaded portion 10 of the handle, and then the wedge or bushing c is forced onto the tapered end of the handle so as to contract the same tightly against the gauging memer. that the gauging member is securely and rigidly heldin place and against rotation. After the thread, for instance that designated by the numeral 14, which has been used for gauging purposes, becomes worn, the bushing may be forced from place, the gauging member unscrewed from the handle, reversed end for end, and then the threaded portion 14 screwed into the handle, and the bushing forced onto the tapered end of the handle. In thiscondition, the thread 15 may be employed for gauging purposes.

Referring now to .the embodiment illustrated in Fig. 4, the gauging member Z) is generally similar to the gauging member I) of the preceding embodiment. The handle The resulting binding action is such has an opening adapted to slidably and sethread, a handle having a threaded portion lectively receive the threaded portions of the gauging member, and the forward end of the handle is internally tapered, as at 25. The gauging member is secured in place in the handle by means of a bushing or sleeve 0. This sleeve, which, preferably, is in two parts, fits about the unthreaded portion 16 of the gauging member and is'externa'lly tapered corresponding to the tapered surface 25. To secure the gauging member in place, the parts oi the sleeve 0 are positioned about the unthreaded portion 16", and one end of the gauging member and the sleeve are slipped into place within the handle. The sleeve is then forced, under pressure, in wardly of the handle so that the sleeve is tightly contracted against the unthreaded portion 16.

It will be seen that, in each of the em bodiments shown, the device comprises but a relatively few number of parts, each of which maybe constructed at a relatively low cost the gauging member has a relatively long life, particularly so since, after one end of it has become worn, the other may be employed for gauging purposes, and the gauging member'is very rigidly, effectively and readily secured in place in "the handle. The threaded portion of the gauging member within the handle is protected against mutilation Or other damage by the handle itself.

It will further be observed that,in the embodiment of Figs. 1 to 3, inclusive, the sleeve 0 is polygonal, tormstance hexagonal,

and is of larger diameter than the gauging member or handle. By preference, thehandle is of such weight as'to overbalance the protruding end of the gauging member so that when the gauge is placed on a flat sur" face the gauging member will beheld out of It is also 'to' be understood that the language used in the following claimsjis in-1 tended to cover all of the generic'and'specific features of the invention herein described and all statements of'the scope'ot theinvention which, as a matterof language, might be said to fall therebetween.

What I claim is 1. A gauge'of the character described-in" cluding a gauging member having a gauging adapted to receive the same, and means for contracting said handle to bind the parts together. p 7

2. A gauge of the character described including a gauging member having a ganging thread, a handle having a contractible threaded portion into which said gauging *threadis adapted to be screwed, and a tapered sleeve for contracting the threaded portion of said handle against said gauging member.

3. A gauge of the character described including an elongated gauging memberhaving at its opposite ends substantially alike thread portions, an elongated handle having a longitudinally slit threaded portion com plementary to the threaded portions of said gauging member and adapted to selectively receive the'same, and means movable longi-' tudinally of said handle for contracting the same against said member.

4.. A gauge of the character described including a handle having a contractible end provided with an internal screw thread, a gauging member having vat opposite ends identical threads complementary to the thread of said handle and adapted to be received thereby, and a sleeve having a wedging fit on said contractible end of said hair dle.

5. A gauge of the characterde'scribed including a gauge member of generally cylindrical" form having-at opposite ends like screw threads, a hollow handle having atone end an internal thread adapted to selectively receive the threads of said gauge member,

said end of said handle being contractible and externally tapered.

6. A gaugeof the character described including a 'gaugingplug having a thread at each end, a handle having acontractibl'e end provided with *a "screwthread con'ip'lementary to the threads of said gauging plug, and

a sleeve "having a wedging fit on *the contrac'tible end of said handle,- said handle overbalancing said plug."

7 A gauge of the'chara'cter describedlneluding an elongated gaug ng plug having a thread at each end, an elongated handle member adapted to selectively receive and house said threads, and a member movable longitudinally of said handle member, one of said members surrounding the-other one, theinner of said members being contractible about said plug. 7

8. A 'gauge'ot-the char'acterdes'cribed including a "gauging plug having-a thread at each end, a m'einberhaving a tape'red'cont'ractible portion fitting about said plug, and a member having a tapered opening wedgedly receiving said first membenone of-said members constituting a handle.

BENGT M. HANSON. 

